Dear @Mackie Jo Ann,
Thank you for reaching out to the Microsoft Q&A forum. I’m pleased to assist you.
If you would like to attach and send a file in a Microsoft Teams chat, you can follow these steps:
Open Chat > select the Attach (+) icon > choose the file you want to upload and send it.
If this does not address your specific scenario, please provide more details about your requirements so I can offer more accurate assistance. I hope this information is helpful. If you need any further assistance, please feel free to reach out. I am here to help. Thank you very much for your understanding and cooperation.